Preparation of carbodiimide in presence of phospholene catalysts

Details Preparation of carbodiimide in presence of phospholene catalysts Preparation of carbodiimide in presence of phospholene catalysts

1977-10-31

1978-08-08

Hamrock, William F.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

526 27, 526 43, 526 46, 526 57, 526275, 528 69, C08F 818, C08F 824, C08F 840, C08F 1232

Patent

active

041056426

ABSTRACT:
Modified polystyrenes are described which are catalysts for the conversion of organic isocyanates to the corresponding carbodiimides. The modified polystyrenes are characterized by the presence of recurring units of the formula: ##STR1## WHEREIN THE BROKEN LINES IN THE PHOSPHOLENE NUCLEUS INDICATE A DOUBLE BOND LOCATED BETWEEN THE CARBON ATOM AT POSITION 3 AND ONE OF THE CARBON ATOMS AT POSITIONS 2 AND 4, THE H atom is attached to whichever carbon atom at positions 2 and 4 is not part of said double bond, R is halogen, alkoxy (C.sub.1-6), phenoxy, hydrocarbyl (C.sub.1-18), halohydrocarbyl (C.sub.1-18), m = 0-3; n = 0, 1; R.sub.1 is hydrogen or methyl; and R.sub.2 is hydrocarbyl free from substituents reactive with isocyanate.

REFERENCES:
patent: 3767708 (1973-10-01), Smith
patent: 3855186 (1974-12-01), Moedritzer
patent: 3855352 (1974-12-01), Moedritzer
patent: 4067820 (1978-01-01), Wagner et al.

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